Millstone-dresser



l Millstone-Dresser.

0- 226,610. Patented Abrily 20. 1880.

liek, MYD-UNMIK. WIIHIIIUNIL UNITED STATES PATENT OFFICE.

DANIEL S. GREENWALD, 0F WARREN, OHIO.

MiLLsToNE-DRESSER.

SPECIFICATION forming' part of Letters Patent No. 226,610, dated April 20, 1880. Appllcatiun tiled September 16, 1879.

To all whom 'it may concern:

Be it known that I, DANIEL S. GREENWALD, of Warren, in the county of Trumbull and State of Ohio, have invented certain new and useful Improvements in Millstone-Dressers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification.

My invention relates to millstonc-drcssers, and particularly to that class of millstonedressers designed to work automatically and driven or operated from a single point; and it consists in the construction and combination of parts, substantially as hereinafter speci iied and claimed.

In the drawings, Figure 1 is an isometric view of my device. Fig. 2 is a detached view in side elevation, of the dressing or cutting tool and its immediately adjacentmechanism.l Fig. 3 is a plan view of the mechanism operating the cutter or dresser. Fig. 4 is aview iu longitudinal section of the vertical shait D and the parts directly attached to and surroundin it.

in the said drawings, A is a frame, of any suitable structure, dimensions, or material, to which the operative elements ofv my device are attached. The drivin g-belt O connects with the pulley C, xed ou the shaft D. To the shaft D is also fixed the pulley E for driving the cutting mechanism. This is done through the belt E and pulley E. The pulley E2 is xed upon a suitable shaft, E, journaled in the frame A,to which shaft is xed a. balance-wheel, E, for imparting a steady motion to the shaft Fi and to the cutting mechanism. Upon the balancewheel E is xed a crank or eccentric, E5, which, through the pitman E6, imparts a reciprocating motion to the cutter F, and which also controls the operation of the automatic feeding mechanism associated with said cutter. The cutter F and its feeding mechanism are arranged and constructed upon a suitable frame, F', which frame is revolubly attached to the vertical :shaft D by a sleeve, F.

F are set-screws, and maybe one, two, or more in number, whereby the sleeve and cut ter-frame F may be affixed at any adjusted height. From the sleeve F2 proceed one, two, or more arms, F", which extend upward and engage in an annular groove formed on the adjusting-nut F5. This adjustin -uut is provided with a female screw/thread engaging with amale thread formed upon asleeve around the vertical shaft D. By turning the nut F5 in one direction or the other it will be raised or lowered in its position on the shaft D, and will carry with it through thc-arms F the frame F', with its cutter and attached mechanism. Thus, by turning the nut F5 the cutter F may be adjusted as necessary, and when adjusted it may be fixed in position by the setscrew F.

The sleeve F, being, as heretofore stated, revolubly attached to the vertical shaft D, permits of the cutter-frame F' and its attached mechanism to remain stationary while the stone to be dressed is revolved beneath it, or, as might be arranged without departing from my invention, the cutterfframe F might be constructed to move over the stone and the stone held stationary.

G is an adjustable brace or support connecting the outer end ofthe frame F' with the upper portion ofthe shaft D by a ring or collar, GJ, loosely iitting upon the shaft D. Gz is a right-and-left-hand screw. G is a. slip-joint, provided with a setscrew, G, and. G is a slot in the lower portion of the brace G.

The elements G, G, G, and Gf, just speci i ed, are all adapted in an apparent manner to permit of adjusting the length of the brace or support G to suit any height or position to which the cutter-frame F may be xed.

Corning now to a more specilic description of the cutter F, its frame F', and attached mechanism, it will be observed, as already stated, that motion is imparted to this portion of my device by the crank E aud pitman E.

The movement which I design to give the cutter F is a reciprocating one, either radial or tangential in direction as related to the stone upon which itis to operate, as circumstances may require. A lateral feeding motion transverse to its cutting direction is also imparted to the cutter.' The reciprocating or cutting movement is imparted by the connection of the pitman E to the cutter-block H.

Within the cutter-block H is journaled on a line transverse to the direction of motion of the cutter F a feeding-shaft, H', having a screw-thread, H, cut upon it. En gaging'with the screw-thread H is the shank or stem H3 of the cutter F.

The cutter'bloclc H has a tongue-and-groove or equivalent connection with the frame F', whereby its motion imparted by the pitnian Eo is permitted.

Attached to the feeding-,shaft H is a pinion or segmental gear, H, adapted to engage with the adjustable rack H5. According as the rack H5 is adjusted nearer to or farther from the vertical shaft D will the lateral feed of the cutter F be respectively increased or diminished, because when moved, say, nearer to the shaft D, a longer engagement between the rack H and segmental gear I-I will be had and a consequently increased turn of the feedingshaft H', which will result in a more extended lateral or feeding movement of the cutter F.

The adjustable rack H5 may be formed in any suitable manner to permit of longitudinal movement and adjustment upon the frame F'. The form herein illustrated is that of the ordinaryr well-kncwn slot and setscrew connection, too common to need specific mention.

In order to enable the cutter properly to move along the grooves of the stone, the frame F' is adjustably attached to the sleeve Fz by means of the circular slot and set-screw connection H. By adjustingthe frameF' through the agency cf this circular-slot arrangement H6, the cutter or dresser F may be made to traverse the stone either radially to and from its center or at a tangent thereto, as may be necessary. i

I have spoken of the adjusting-nut F5, and it is through this device that the coarser adjustment of the dresser F to the stone is ef fected. 1t is necessari' f, however, that anicer adjustment shouldbe had than can be readily effected by the nut Fi", and for this purpose the nut or thumb-screw F is provided, whereby a linerA and more delicate adjustment be tween the dresser F and the stone upon which it is to operate can be effected.

' It is important that the dresser Fshould have a steady andA firm movement and be prevented from wabbling while in operation, and to contribute to this end its shank or stem should be held as firmly as possible. It has dcvetail tongue and groove connection with the frame F', and for this reason should always have its bearings kept snug and free from lost motion, and to accomplish this the adjustable upper bar, L, is provided. This, by its slot and set-screw connection with the frame F' enables it to be iirnily adjusted and secure in such a manner that the shank or stem H is always held firm and steady, and as wear occurs this bar L may be readjusted and lost motion thereby always taken up.

The plates L', which constitute a portion of the grooves in the frame F', are also adjusta bly attached in substantially the same manner and for the same reason as already speciiied for the bar L.

In dressing beveled surfaces-such as fur rows and the lilre-it is necessary that the frame F' and the feeding-shaft Hil should be set at an incline corresponding to the surface to be dressed, so as to enable the dresser F to properly traverse said surface. To accomplish this inclined adjustment of the cutter-frame F' and its attached parts, I construct the shank F'cf the frame F of two plates, united, as shown, by the ordinary slot and set-screw arrangement, the slot being formed on the are of a circle concentric with the longitudinal axis of the frame F'. By loosening the setscrews F the frameF' may be tilted to any desired angle and then adjusted.

In order at the same time to increase the effectiveness of the set-screws FfI in retaining the cutter-frame F' in position, and also to prevent any injurious effect to the shaft D from said set-screws, the friction-bar F9 is pro vided, directly against which the setscrews F3 impinge, and by pressing the bar F between them and the-vertical shaft D a very firm adjustment is secured without injury to the parts.

M is a jam-sleeve, secured in position by the set-screw M' upon the vertical shaft D. This jam-sleeve assists in keeping the sleeve F2 and its attached parts iirmly in their adjusted position, and prevents accidental yielding or displacement of the dresser F' during its operation.

As illustrated in Fig. 4 of the drawings, the vertical shaft D is pivotally attached tov the spindle P, upon which the ruiming millstone hangs and turns. This illustrates the manner of adjusting my device in dressing the bedstone. t

In dressing the runner-stone the stone is removed, and after being turned over and leveled the stationary shaft D is adjusted to the bail in substantially the same manner as illustrated in Fig. 1 of the drawings.

Before the device is set in operation for fac ing a stone the stone itself should be leveled, and likewise the frame F', and when this is done and the cutter or dresser F .properly adjusted a true face may be obtained with ease and certainty. This leveling of the frame F is IOO accomplished by the right-and-left-hand screw G or the slot and set-screw arrangement G5, or both.

I prefer forming the male screwthread upon which the adjusting-nut I3s turns upon an'independent sleeve surrounding the vertical shaft D, and fixed thereto in any adjusted position by a set-screw, Fn. By loosening the set-screw F the screw-sleeve F" may be moved up or down upon the shaft D and the entire dressing or cutting mechanism thereby vertically adjusted.

The ring or collar G' lof thel brace G is held `between two jam-collars, G6, held in any adjusted position by set-screws. Byr means of these jam-collars the upper-ring terminus G' of the brace Goan beiixed at any desired point on the shaft D.

In order to accommodate various adjustments, the pitman E6 should be formed in two or more parts, with swiveIcd-joint connections or the like, so that its length may be adjusted as required, and so that it may be otherwise adjusted to aiord a suitable connection between the wrist-piu lil5 and the cutter-bar F.

I do not limit myself to an exact construcin'on ofthe parts E, E, E, and E5. This portion of my device may be varied at pleasnre, and may be placed either upon the same side of the shaft D that the cutter-frame is located or upon the opposite side; and when placed upon the opposite side the pitman EE should be forked and made to straddle the vertical shaft D. In case of extreme vertical adjustment of the cutter-bar F' it may at times be necessary to also vertically adjust the parts E', E, E, E4, and E5, and for this purpose the frame-work in which they are placed may be constructed to be bodily lifted or lowered until the belts shall be properly stretched.

1. In a millstonedresser, the combination, with the cutter or dresser F and its frame F', of the adjustngnut F5, whereby the frame F' may be verticallyr adjusted, substantially as and for the purpose shown. j

2. The combination, with the cutter F, of the adjusting-screws F5 F, the former being for coarse and the latter for fine adjustment,

substantially as and for the purpose shown.

3. The cutter-frame F' and shaft D, in combination with the circular slot and setscrew connection F, whereby the cutter may be made to traverse the stone either horizontally or at any angle to a `horizontal plane, substantially as and for the purpose shown.

4. The combination, with a feed-shaft on which the cutter-stem is threaded, of a rack adapted to be secured in desired longitudinal adjustment, and having gear engagement with said feed-shaft, substantially as set forth.

5. The combination, with the segmental feeding-gear H4, of rack H, said rack H'i be ing made longitudinally adjustable, whereby it may be brought more or less into engagement with the gear H4, and thereby impart to said gear a greater or less feeding movement, substantially as and for the purpose shown.

6. In a millstone-dressing machine, the conibiua-tion, with a cutter-stem provided with o lateral projection, and a cutter-block on which thc latter lits, of a transverse bar which clamps said projection firmly in place, togetherwith slot-and-bolt connection which secures said bar in vertical adjustment to the cutter-block, substantially as set forth.

7. The adjustable rack H5, in combination with suitable mechanism for imparting to it a to-aud-fro motion, substantially as and for the purpose shown.

8. In combination with the brace or support Gr, the ring G' and the shaft D, substantially as and for the purpose shown.

9. The combination, with the adjustable brace or support G, of the slip-joint G G* and the cutter-frame F', substantially as and for the purpose shown.

10. The brace or support G, bifurcated at its lower portion and provided with the slots G5, in combination with the cutter-frame F', substantially as and for the purpose shown.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

DANIEL S. GREEN WALD.

Witnesses JN0. OROWELL, Jr., W. E. DONNELLY. 

